Hi there,
Unfortunately there’s no way to tell unless you know what went wrong, or how it went wrong.
One thing you can do is go back to your guide, save it as a new scene, and try rebuilding. Is it still broken right after building? Did you notice any errors while buildig? Then we can figure it out from there, and you don’t lose any of your customizations.
A) If it’s broken after building, it might be something in your guide, or it might be a bug in your version of mGear/Maya. If this is the problem, then you can possibly share the guide for someone to check.
B) If it’s not broken after building, then it’s possible that something went wrong during your customizations, and you’ll now have a clean build that you can compare to, to attempt to fix the customized version. It might be as easy as fixing a lost connection.
If you do that and still need help, report back with your mGear and Maya versions.